Chemical Reactions and Chemical Equations

What are Chemical Reactions?

• It's when you mix substances.

• a process in which atoms rearrange to form new substances

• When something bubbles.

• letter and numbers showing the types and number of atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the following reaction, what sign is there that a precipitation reaction took place?
AgNO₃ (aq) + NaOH (aq) → AgOH (s) + NaNO₃ (aq)

• The formation of a nitrate

• The (aq), meaning aqueous or dissolved in water

• The (s), meaning the formation of a solid

• The base (OH) reactant 

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NGSS.MS-PS1-2

The number of atoms you begin with in a chemical reaction ...

• must be the same as the number of  atoms you end with

• must be an even number

• can be different to the number you finish with

• changes depending on how much energy is formed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When balancing equations, the rule is that you can only add ...

• Coefficients

• Mass

• Subscripts

• Elements 

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NGSS.MS-PS1-5

​ (a)   denote the number of atoms of an element in a molecule, and ​ (b)   denote the number of a molecule in an equation

• Subscripts

• Coefficients

• Superscripts

• Exponents

• Parentheses

• Cofactors

Tags

NGSS.MS-PS1-1

In a chemical equation "aq" means ​ (a)   . This word means "dissolved in water". The compound or element has been put into water to form a solution ​or homogenous mixture. "l" means ​ (b)   . this means the compound or element is in the liquid phase. It has not been mixed with anything else. The arrow in a chemical equation means ​ (c)   . On the left side of the arrow are the ​ (d)   , and on the right side of the arrow are the ​​ (e)   .

• Aqueous

• liquid

• yields

• reactants

• products

Match to show which chemicals are the reactants and which are the products in this chemical equation

• Product

• H₂O

• Reactant

• Na

• Reactant

• NaOH

• Product

• H₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Iron + Copper Oxide -----> Iron Oxide + Copper

is an example of a​ (a)   reaction

• displacement

• electrolysis

• combustion

• hydrolysis

• bioleaching

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical equation, the arrow points towards the ​ (a)   of the reaction.

• products

• reactants

• elements

• compounds

Balance this equation ​ (a)   N₂ + ​ (b)   H₂ --> ​ (c)   NH₃

• 1

• 3

• 2

Tags

NGSS.MS-PS1-5